drivers/char/tpm/tpm.h

   1 /*
   2  * Copyright (C) 2004 IBM Corporation
   3  *
   4  * Authors:
   5  * Leendert van Doorn <leendert@watson.ibm.com>
   6  * Dave Safford <safford@watson.ibm.com>
   7  * Reiner Sailer <sailer@watson.ibm.com>
   8  * Kylene Hall <kjhall@us.ibm.com>
   9  *
  10  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  11  *
  12  * Device driver for TCG/TCPA TPM (trusted platform module).
  13  * Specifications at www.trustedcomputinggroup.org
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation, version 2 of the
  18  * License.
  19  *
  20  */
  21 #include <linux/module.h>
  22 #include <linux/delay.h>
  23 #include <linux/fs.h>
  24 #include <linux/mutex.h>
  25 #include <linux/sched.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/io.h>
  29
  30 enum tpm_timeout {
  31         TPM_TIMEOUT = 5,        /* msecs */
  32 };
  33
  34 /* TPM addresses */
  35 enum tpm_addr {
  36         TPM_SUPERIO_ADDR = 0x2E,
  37         TPM_ADDR = 0x4E,
  38 };
  39
  40 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
  41                                 char *);
  42 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
  43                                 char *);
  44 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
  45                                 char *);
  46 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
  47                                 char *);
  48 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
  49                                 const char *, size_t);
  50 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
  51                                 char *);
  52 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
  53                                 char *);
  54 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
  55                                 char *);
  56 extern ssize_t tpm_show_temp_deactivated(struct device *,
  57                                          struct device_attribute *attr, char *);
  58
  59 struct tpm_chip;
  60
  61 struct tpm_vendor_specific {
  62         const u8 req_complete_mask;
  63         const u8 req_complete_val;
  64         const u8 req_canceled;
  65         void __iomem *iobase;           /* ioremapped address */
  66         unsigned long base;             /* TPM base address */
  67
  68         int irq;
  69
  70         int region_size;
  71         int have_region;
  72
  73         int (*recv) (struct tpm_chip *, u8 *, size_t);
  74         int (*send) (struct tpm_chip *, u8 *, size_t);
  75         void (*cancel) (struct tpm_chip *);
  76         u8 (*status) (struct tpm_chip *);
  77         void (*release) (struct device *);
  78         struct miscdevice miscdev;
  79         struct attribute_group *attr_group;
  80         struct list_head list;
  81         int locality;
  82         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
  83         unsigned long duration[3]; /* jiffies */
  84
  85         wait_queue_head_t read_queue;
  86         wait_queue_head_t int_queue;
  87 };
  88
  89 struct tpm_chip {
  90         struct device *dev;     /* Device stuff */
  91
  92         int dev_num;            /* /dev/tpm# */
  93         unsigned long is_open;  /* only one allowed */
  94         int time_expired;
  95
  96         /* Data passed to and from the tpm via the read/write calls */
  97         u8 *data_buffer;
  98         atomic_t data_pending;
  99         struct mutex buffer_mutex;
 100
 101         struct timer_list user_read_timer;      /* user needs to claim result */
 102         struct work_struct work;
 103         struct mutex tpm_mutex; /* tpm is processing */
 104
 105         struct tpm_vendor_specific vendor;
 106
 107         struct dentry **bios_dir;
 108
 109         struct list_head list;
 110         void (*release) (struct device *);
 111 };
 112
 113 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 114
 115 static inline int tpm_read_index(int base, int index)
 116 {
 117         outb(index, base);
 118         return inb(base+1) & 0xFF;
 119 }
 120
 121 static inline void tpm_write_index(int base, int index, int value)
 122 {
 123         outb(index, base);
 124         outb(value & 0xFF, base+1);
 125 }
 126
 127 extern void tpm_get_timeouts(struct tpm_chip *);
 128 extern void tpm_gen_interrupt(struct tpm_chip *);
 129 extern void tpm_continue_selftest(struct tpm_chip *);
 130 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 131 extern struct tpm_chip* tpm_register_hardware(struct device *,
 132                                  const struct tpm_vendor_specific *);
 133 extern int tpm_open(struct inode *, struct file *);
 134 extern int tpm_release(struct inode *, struct file *);
 135 extern void tpm_dev_vendor_release(struct tpm_chip *);
 136 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 137                          loff_t *);
 138 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 139 extern void tpm_remove_hardware(struct device *);
 140 extern int tpm_pm_suspend(struct device *, pm_message_t);
 141 extern int tpm_pm_resume(struct device *);
 142
 143 #ifdef CONFIG_ACPI
 144 extern struct dentry ** tpm_bios_log_setup(char *);
 145 extern void tpm_bios_log_teardown(struct dentry **);
 146 #else
 147 static inline struct dentry ** tpm_bios_log_setup(char *name)
 148 {
 149         return NULL;
 150 }
 151 static inline void tpm_bios_log_teardown(struct dentry **dir)
 152 {
 153 }
 154 #endif